We have known for some time that Avatar 2 and Avatar 3 are in the works, and, back in May, director James Cameron teased the possibility of a 4th Avatar film as well. Actress Sigourney Weaver dropped some major news today, revealing that all three sequels are a reality and will be shot simultaneously this fall, after she wraps on the USA Network mini-series Political Animals. Here's an excerpt from a recent article.

"When Political Animals finishes shooting, see if you can follow Weaver's schedule: she goes right into a new Christopher Durang play for a short run at Lincoln Center. Then she films Avatar 2, Avatar 3, and Avatar 4 with James Cameron. That's right: they're making three sequels to the blue 3D phenom all at the same time. Weaver says she has no idea how long it will take, or how it's going to work. 'I just show up,' she said."
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Our report from May also revealed that the director was only making Avatar movies and documentaries from now on. Producer Jon Landau also stated in April that they might not hit the December 2014 release date for Avatar 2. However, if production does in fact start up this fall, that release date may be attainable after all.